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It has a very branching habit quite from the base like a well-grown bush of the common wallflower. The flowers are abundant, about 2½ inches across, with a black disk. The plant, though a true herb, never comes up in my garden with more than one stalk each year. H. rigidus is well known as the best of the perennial sunflowers, and has many synonyms, the commonest Harpalium rigidum.
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